Manufacture of glass having surface projections.



No. 867,931. PATENTED OCT. s, 1907.

. v 1-". L. o. WADSWORTH.

MANUFACTURE OF GLASS HAVING SURFACE P'ROJEGTIONS.

APPLICATION FILED MAY 20. 1904.

WITNEQSES ENVENTOR invented a new and useful Improvement in the'Manu facture of Glass Surface Projections, of whichv the following is afull, clear, and exact description, ref- I 1 STATES P T T oF ICE- FRANK 1.. 0. WADSWORTH, or noReAN'roWN, WEST VIRGINIA, ASSIGNOR 'io PnEssEnPmsn PLATE emssoonrm, OF NEW YORK, ,N. .Y., A CORPORATION OF wss'r vmemm.

Mann-sacrum; or emss nnvme snnsaonraomorrons.

no. 867,931 l To all whomjtmay concern:

Be it known that 1, Fans]: L. O. Wansworrrn, of Morgantown, Monongalia county, West Virginia, have erence being had to the accompanying drawings, forming part of this specification, in which' Figure 1 is an end view of a table suitable for the practide of my invention; 2 is a plan view;'Fig. 3 is a vertical sectionon the line 111411 of Fig. 2; Fig. 4 is a sectional view illustrating a sheetof glass made with the apparatus shown in the other figures.

The purpose of my invention is to provide for the manufacture of glass sheets, blocks, or other articles having surface projections, such as keys for holding tiles or slabs to a bed of cement on the surface of awall, or for forining prism projections or the like on glass sheets. I will describe it with reference to the manufacture 31 a glass plate or slab, 2, such as shown in Fig.

4, having surface-keys 3 of dovetail shape designed to afford a bond to attach the glass to a ccment wall. I employ a table having surface grooves, and when the glass has been cast or rolled upon the table and portions of it have entered the grooves, the sides of the grooves: are brought together upon the therein so as to compress and shape it as desired.

The preferred form of apparatus with which'my invention is carried into effect is shown in the drawing, in which the table is constituted by a bed-plate 4 having on its surface a series of gooves 5,5with inclined' sides constituting ways in which slide oppositely movable strips 6, 7, the surfaces of which constitute the rolling surface on which the glass sheet is formed, and

the spaces between the adjacent strips 6, 6 constitute the grooves which shaped The strips 6, 7 are of wedge-shape as shown in Figs. 2 and 3, so that when the members of the adjacent pairs of strips are moved in opposite directions, they will widen or narrow the intermediate groove-spaces. For

the projections on the glass are this purpose I provide a rock-shaft 8 at each end of the outwardly from the table in opposite directions, and by moving the shaft in the other direction (downwardly'as shown in Fig. 1) the stripswill be moved inwardly in Specification of Letters Patent. Application filed May 20,1904. swarm. 208,910;

I I Patented Oct. 8, i907.

The outward motion will widen the intervening grooves or spaces 12 and the inward motion will contract them.

In the use of this apparatusa body of glass is placed upon the surfacepf the strips 6 and 7 and is rolled or otherwise distributed thereover into a sheet or slab,- and portions of the glass'will enter .the grooves 12, but owing to the dovetail shape of these grooves the glass' does not perfectly fill the same. Then by means of the mechanism above described the strips are moved inwardly so as to contract the grooves 12 and to press the strips laterally against the glass therein, thus shaping and molding it .to the desired dovetail contour. The strips are then retracted so as to widen the grooves 12 and to free the dovetail projections" of theglass from holding engagement with the strips, whereupon the glass may readily be removed from the table. The pressure applied to the glass by contracting the walls of the grooves is applied otherwise than through the body of the glass.

It will be seen that the strips 6 and 7 are so arranged that their movement does not change the form of the table surface, but simply changes the width of the grooves 12; also that no matter what their position, the only opening in the table surface is that made by these grooves. In these respects my method is believed to differ essentially from all prior methods, in which the movable portions of the forming surface have been so 'ing surface, and produces irregularities of such surface,

if it does not prevent the operation of the apparatus.

Afurther distinctive feature of my method consists in the fact that the motion of the movable strips is in a direction parallel to the ribs or projections, thereby giving a sliding formative action which isof great advantage. My method also avoids placing undue strains upon the glass. In some cases it will not be necessary to employ the first motion of the strips by which the grooves are narrowed and the intermediate portions of theglass pressed, and it will suflice merely to retract the strips to widen the spaces and free the glass.

Within the scope of my invention the form of the apparatus and the mechanism by which the grooves are varied in width may be changed, since What I claim is:

1. The herein described method of making glass having surface projections which consists in distributing the glass on a grooved surface in sheet form with portions thereof. in the grooves of the surface,'and then moving the walls of the grooves relatively in a direction both oppo'site 'directions'toward the middle of the Itabl'e.

' lateral and 'en'dwise to cause them to exert a sliding tormative'and compressive action upon the glass; substantlnlly as described. I

- 2. The herein described method making glass having 5 surface projections which consists in rolling a sheet or slab of glass upon a grooved suliace, and then moving the walls of the grooves both endwise and laterally to exert a compressive formative action upon the glass-in-the grooves substantially as described.

3. The herein described method of making glass having surface projections, which consists in distributing the glass on a grooved surface with portions thereof in the grooves of the surface, then moving the groove-walls in a direction both lateral and endwise to cause them to exert a sliding formative and compressive action upon the glass ln'the grooves, and then spreading the walls to release thegiass substantially as described.

4. The herein described method or making glass having surface projections, which consists in distributing the glass on a grooved surface with portions thereof in the .grooves, and then compressing and shaplng the glass in the grooves by moving the grooved walls both laterally and endwise while maintaining their parallelism; substantially as described.

In testimony whereof, I have hereunto set my hand.

FRANK L. 0. WADSWORTH.

Witnesses:

THOMAS W. Bsmswrrnn, Geo. B. Bnsiumo. 

